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Brain
Question | Answer |
---|---|
coverings of brain and spinal cord, consist of 3 layers | meninges |
consists of two membranes and outer periosteal, and immer meningeal | dura mater |
is close to the inner surface of the skull and usually adherent to it | outer periosteal |
3 membranes that surroundes and protects brain | meninges |
stronges and outermost membrane | dura mater |
provide venous drainage from the brain | dural sinuses |
seperates the cerebral hemispheres | falx cerebri |
spreads out like a tent, forms partition between cerebrum and cerebellum | tentorium cerebelli |
middle laywer which is trabecular (cobweb-like) in structure | arachnoid membrane |
inner layer, which closely invests the brain, dipping in the furrow | pia mater |
sperates the pia mater from the arachnoid mater | subarachnoid space |
contains cerebrospinal fluid that circulates around the brain and the spinal cord and provides further protection to the central nervous system | subarachnoid space |
in living animals the spaces between the meningeal layers are filled with | cerebral spinal fluid |
the left and right hemispheres are divided by | longitudinal fissure |
cerebral hemispheres have to distinct features | riges (gyri) and Furrows (sulci) |
composed mostly of nerve cell bodies and unmyelinated fibers | gray matter |
white fatty material composed chiefly of lipids and lipoproteins | myelin |
composed mostly of myelinated fibers. is internal | white matter |
bridge of myelinated nerve fibers. Carry impulses from one hemisphere to another | Corpus callosum |
provides a pathway for the circulation of the cerebral spinal fluid throughout the CNS | ventricular system |
four fluid-filled cavities | ventricles |
first ventricles, each communicates with ventricle III | lateral ventricle |
communication from lateral ventricles to ventrical III through an interventricular foramen called | monro |
connected to fourth ventricle | ventricle III |
canal that connects 3 and 4th ventricle | aqueduct of sylvius (aka cerebral aqueduct) |
located in diencephalon | ventricle III |
located in the hindbrain | fourth ventricle |
fourth ventricle connects to the central canal of the | spinal cord |
brain is divided into how many parts | 6 |
6 parts of brain are called | cerebrum, cerebellum, diencephalon, midbrain, pons, medulla oblongata |
divided into thalamus and hypothalmus | diencephalon |
midbrain, pons, medulla oblongata are often called | brain stem |
largest brain division | cerebrum |
coordination of muscular activities are controlled by | cerebellum |
cerebellum contains | gray and white matter |
positioned superiorly and anteriorly in the cranial cavity | cerebrum |
cortex is composed of | gray matter |
corpus callosum and fornix are | white matter |
lies between the cerebrum and midbrain | diencephalon |
large and lies superior to the hypothalamus | thalamus |
transmits impulses to higher brain regions and motor impulses from the cerebrum to the rest of the body also transmits inpulses to the limbic system | thalmus |
responsible for emotion | limbic system |
responsible for regulation and maintenance of internal homeostatsis | hypothalamus |
refers to the body's ability to regulate physiologically it's inner enviroment to ensure it's stability in response to fluctuations in the ouside envirometn and weather | human homeostatsis |
extends inferiorly from the hypothalamus | stalk known as infundibulum |
at distal end of the infundibulum | pituitary gland or hypophysis |
extends inferiorly between the diencephalon and the pons | midbrain |
both sesory and motor nerve fibers, carry impules between spinal cor and brain are found here | midbrain |
middle section of the brainstem above the medulla | pons or bridge |
regulates breathing and arouses the cerebrum to the conscious state | pons |
most inferior portion of the brainstem | mudulla oblongata |
connects the brain to the spinal cord as it exits the cranium through the foramen magnum of the occipital bone | medulla oblongata |